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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Of course, you are free to try to work around the issue, but traffic captures will explain what is really happening and then determine what the simplest workaround might be. Traffic analysis will either point to or eliminate the need or desire to swap cards.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I’d suggest that you try using the MultiNet IP stack. I’ve had experience with MultiNet for 20+ years and even now, leave telnet sessions connected for many days and never see a problem. Switching to MultiNet will avoid the need to migrate users or configure a new OS from scratch or perform an upgrade. I strongly suspect that both MultiNet and the HP TCP stack can be installed on the same system at the same time as long as you only start one OR the other in your systartup configuration.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> simh-bounces@trailing-edge.com [mailto:simh-bounces@trailing-edge.com] <b>On Behalf Of </b>Lorenzo<br><b>Sent:</b> Wednesday, April 30, 2014 8:30 AM<br><b>To:</b> Mark Pizzolato - Info Comm<br><b>Cc:</b> simh@trailing-edge.com; Rick Murphy<br><b>Subject:</b> Re: [Simh] OpenVMS 7.2 VAX telnet failure<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Before starting to dig into traffic captures I'd like to try two more things:<br><br>* a OpenVMS 7.3 setup on a new SIMH machine - if that works then I can think about migrating users and data from 7.2<br>* using a different ethernet card to rule out layer 1 problems<br><br>This problem is not easily reproducible, "it just happens", so I can only report back after a certain amount of time.<br>Thanks for now<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>2014-04-30 16:59 GMT+02:00 Mark Pizzolato - Info Comm <<a href="mailto:Mark@infocomm.com" target="_blank">Mark@infocomm.com</a>>:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>As Rick suggested, you should capture traffic in both directions. Wireshark is an excellent tool for that. Additionally, Wireshark has built-in protocol decoders which can interpret what is happening in the TCP telnet session. If you aren’t familiar with, or don’t want to dig into the details of the packet innards, you can save the capture contents, make it available, and let me or someone else can interpret the details and offer analysis.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a href="mailto:simh-bounces@trailing-edge.com" target="_blank">simh-bounces@trailing-edge.com</a> [mailto:<a href="mailto:simh-bounces@trailing-edge.com" target="_blank">simh-bounces@trailing-edge.com</a>] <b>On Behalf Of </b>Lorenzo<br><b>Sent:</b> Wednesday, April 30, 2014 7:25 AM<br><b>To:</b> Rick Murphy<br><b>Cc:</b> <a href="mailto:simh@trailing-edge.com" target="_blank">simh@trailing-edge.com</a><br><b>Subject:</b> Re: [Simh] OpenVMS 7.2 VAX telnet failure</span><o:p></o:p></p></div></div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>What nmap is reporting should be the traffic from the VAX to the client.<br>No matter the client I use (e.g. telnet.exe, PuTTY...), all I get is an endless stream of chars, which matches what appears in the traffic dump.<o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Upgrading to SIMH 4.0 beta had no effect - after 14 hours I experienced the same exact problem.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>During the telnet outage, which happened after ~14 hours of SIMH running, FTP was still working fine.<o:p></o:p></p></div></div></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>2014-04-30 2:50 GMT+02:00 Rick Murphy <<a href="mailto:rick@rickmurphy.net" target="_blank">rick@rickmurphy.net</a>>:<o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>At 06:21 PM 4/29/2014, Lorenzo wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi!<br>I'm running OpenVMS 7.2 VAX on a simh emulator, latest release<o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>(V3.9-0 from <<a href="http://simh.trailing-edge.com" target="_blank">http://simh.trailing-edge.com</a>><a href="http://simh.trailing-edge.com" target="_blank">simh.trailing-edge.com</a>) and compiled with networking (libpcap, no vde).<o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br>The emulator has got its own network card to which it's attached.<br>The host operating system is Linux, kernel 3.11.<br>My issue is that after an apparently random amount of time (usually a few hours) the telnet server stops working.<br>I can't get any client to log in remotely - as soon as I connect to the OpenVMS machine,<br>all I get is a blank character sequence, as follows (dumped by nmap):<br><br>SF:NULL,1138,"\xff\xfb\x01\xff\xfb\x03\xff\xff\xff\xff\0\0\0\0\0\0\0\0\0\0<o:p></o:p></p></div></blockquote><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><br><br>There's a beginning of some TELNET options negotiation going on there.<br><br>That's the following:<br>255 (IAC)<br>251 (WILL)<br>1 (ECHO)<br>255 (IAC)<br>251 (WILL)<br>3 (SGA) [Suppress go-ahead)<br><br>That's pretty standard.<br>The series of 0xff (IACs) and nulls that follow aren't.<br><br>You really need to capture the traffic to-and-from. Is this coming from the VAX to your client, or vice versa?<span style='color:#888888'><br> -Rick</span><o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>